Crushing-machine.



/ T. L, @L T. J. STURTBVANT.

CRUSHING MACHINE.

.APPLICATION FILED 00T. 16, 1909.

Patented Aug. 4, 19m

LIIS.

Unkn- T. L. & TfJ. STURTEVANT. GRUSHINGvMACHINE.

APPLICATION FILED 00T. 16, 1909.

T. L. a T. J. STURTEVANT.

GRUSHING MACHINE.

APPLICATION FILED OGT.16,1909. gj A 59?, 1.3539 Eatented Mg. 1914..

3 SHEETS-SHEET 3.

. To all whom 'it may concern:

THOMAS :tacoma srirnvairor *A WEL-Laster, MassacmrsnrrsV as, coaroaarron or' Maxim.`

momia'.

appnation inea on;

Be it known that We, THOMAS L. S'rUmai'i--r vAN'rand'THoMAs J.' STURTEVANT, citizens ofthe United States, residing, respectively, at Quincy and' Wellesley, inthefcounty. ofy Norfolk and State of Massachusetts, have invented vor discovered certain new and useful. Improvements in ,Crushing-.Machines of' which the `following .isi a specification, reference being had therein to the accompany-fy a ing drawings. e

This invention. relates to that classf of crushing machines in which the reduction-of the material is effected byA means: of a.. rotating anvil ring and coperating hammer frollsf -yieldingly:orcedvtoward said ring, the present` invention. relating to' certain-improves mentsyin' crushing machines of this class-,was will hereinafter appear. a In the operation of crushing'machines," of.

theclass vreferred to, in reducing some kindsvr y oiI materials, suchI as moistlimestones, -clay,.. etc., the material being crushed is liable=to1- pack. onv `the anvilring, and by adhering thereto prevent the proper operation of thel machine, as the crushed material does not 'i discharge i properly from the anvil ring;

To obviate this objection `we .provide an. anvil ring which Will'have aserxes of'iopenmgs through `which the crushed material, which' 5 might otherwise have a "tendency tofpack `on theV crushing face of the. anvil ringJ will be. forced through the ring by the operationot the hammerrolls.l Thiseature of our iii-- vention may be carried `into eiiect in Avarious ways, Vas by providing the anvil .ring with aX series of holes or slots of vany desired. shape or arrangement so as to form a foraminousor skeleton ring, or askeleton or open-.Workanvil 'ring maybe providcd'feby building upf Asuoli ring by axnumberof rnarrow rings' or sections properly spaced apart and secuifedA in place; and such foraminou'suorV skeleton ring'iv'ill be adapted for use'in machinesin Which the anvil ringmay be arrangedfto run on a series of inside or outside rollers, or niwhichthe ring-is carried by a rotating head secured toa suital'ile-drivingshaft.

The presentv improvedmachine is also .pro-1 vid :d'\vith a series of balance springsvacting on the hammer rolls'm suelta manner astos.

overcome; ythe action of gravityand .permitanE .ri'ri'hu'n'r crushing pressure? ato y'beu'v given" :x nst the material fed to tllle'anvi--lring.'.4

tls-o the present improved n'ra'ehine{prefer-1 fipa. i

oigel. liet i ir, sans.

i thevmaterialfto be crushed 'Will'be mechani- Gally fed to the anvil 'ring' but the hopperof .Wh1ch;-eed1ng devicelis of such construct-ion' -asito permit the .tailings to be :conveyed to .the'delivery feed spout Withoutbeing fed un .atlthe opening through' Which the -neW 'material conveyed to the feed spout bythe lsald feeder enters. f A' .In the .accompanying drawings Figure l @is a Ilongitudinal*.sectional view, partly' in elevation,` .of a crushing lmachine embodying ithe present. improvements; l-rFig.` 2 is an end ,vievvnof thefsamelooking from the right of lFig. 111 .FigafvisaC-vertical section through the: hopperbf .the mechanical feeder shown `1n';F1g-s.. l andY 2. Fig. 4c -is/a side view of 'the5 anvil-ring carrying-head shown in Fig. l. igs.-;5 and '6 show slightly modiii'ed forms .of foraminous or grated anvil rings.v i Referring toithe drawings, 12 denotes the gbaseo thefmahine from whichA vrise stand-` ards 13.y in` which is `journalecl the driving fshaft.V H-.hafving awpulley l5.' To the said yshaft is attached, infany suitable manner, a ySkeleton head/or spider 16 carrying an open- Work or'foraminous anvil ring lpreferably 'consisting Aoi aseries of 'separate narrow rings spaced apartb means of Washersll` on the bolts 19 by W ich the said separated rings are .attached to the said head 16. The ringszformingthe built-up anvilring l? are jpreferably ,formed Slightlyy outwardly taper- ,ingincross section,.so. that the slotsor lSpaces between the saidxrings will be slightly I 'laring,.to .facilitate the discharge of the ma# lterial through lthesaid slots or spaces. The-f open-Work anvilnring is, vas above stated, 1carried `by va skeleton head or spider, sothat {"it.is more or less vopen, on both sides "toperf fmit'thefreduced material totbe discharged from'the sides' of the ring; asfwellfas through `the-.sl'otsor openings infthe saidoring; the ffront face of the ring being entirely fopen, as shoivn.- f u i Y The rotating foraminous anvil ring17,` as is usual in ring-roll crushing machines of the l class towhich this'y invention 1elates,1rotatesl with sufficient. rapidityto "retainf the/mate#l rial againstztheinner face of thering Tandv carry itfftofthe-rupp'er iside of the y f `5 h comprises ai'ifieedin'gldevice-by-which ico due to the fact that a plurality of yieldingly mounted crushing'rolls are employed in cooperation with said ring. Thus the crushing operation is carried on very much faster 5 than 1t can be in ball and drum machines, or in machines in which the crushing is effected pnly" at the lower parts of the rings or drinne. The anvil ring is mounted in the chamber of a casing which forms a part of the frame of the machine, and which is prof vided with suitable standards 21 sup-porting bearings for the driving shaft 22 of the mechanical feeder. Said feeder is, or may 15 be, essentially the same in principle as that "covered by our Patent No, 879,423, granted February 18', 1908, in that it comprises a material-receiving pan or receptacle'23, having open sides, and a vibrating feeding bar swinging in said pan and forcin the ma-y terial 'out over the open sides of t e latter. The swinging bar 24 is operated from a rock-shaft 25 having an arm 26 connected by a pitman 27 with an eccentric 28 on the rol tating driving shaft 22.` The feed hopper. 241 -communicates with a feed spout 29 which delivers material 'to be crushed to the anvil ring, said feed spout being preferably mounted 1n or formed as a part of the swinging end head 30 in which the anvil rolls are mounted. The end head 30 is provided with parts or arms 31 pivoted on the post 32, so that the said end head, when unbolted from the casing 20, may be swung 9,5v outward to afford access to the chamber of the mill, and in such outward swinging movement said head will carry with it the delivery feed spout 29 which is formed separate from the hopper 241.

The coperative action of the anvil ring and hammer rolls of the present machineis similar to that of the crushing machine covw lered by our Patent No. 906,829, granted December 15, 1908, in that the hammer rolls 45I 33 are mounted on bearing pins 34 attached to carriers pivotally mounted in the end head 30 and acted on by springs which will yieldingly force the hammer rolls toward the crushing or working face of the anvil. ring. In the present machine thev carriers 35 are provided with inwardly projecting parts or lugs 36 acted on by the centra-l bal`- ance washer 37 between which and the said arms or lugs are preferably interposed roller 55 bearings for permitting of a proper rela- 'i tive movement of these parts. The balance 4 washer is engaged by a central thrust screw 38 secured in a three-arm spider 39 which is acted on by springs 40 which are inside oit' housing plates 41 held in place by bolts 425i connected with suitable recessed parts of the said end head 30.

To properly balance the hammer rolls 33 Iand to counteract the action of gravity, so

that said rolls may be given, as nearly as.

possible, a uniform crushing pressure against the material on the-anvil ring, a series of balance springs 43 are provided, said springs being connected by bolts 44 with ears 45 formed on the pivoted carriers 35.

To effect a suitable adjustment ofthe anvil ring relative to the hammer rolls, 1n get- 'ting the parts into proper coperative relation, and inlkeeping them in such relation,

the driving shaft 14 is preferably made lon- 75 gitudinally adjustable 1n its bearings, to a limited extent, by providing abutment collars 46 which are arranged on opposite sides of the bearings for said shaft provided -by one of the standards 13; so that by loosening the set screws by which said collars are attached to said shaft the latterfmay` be shifted endwise slightly to effect a lateral Vadjustment of the anvil ring, after which said shaft will be secured in its adjusted po- -sition when the set screws attaching s aid collars to said shaft are properly tightened with the said collars abutting against the.' bearing portions of said standard.

To avoid undue wear of the mechanical feeder, which supplies to the anvil ring the material to be reduced, the feed hopper is.

provided with one or more entrances 47 through which the tailings may be returned to the mill and be entered into the hopper 241 without requiring such tailings to pass through the opening 48 through which the new material which is fed to the automatic feeder enters. With some kinds of refractory material, which is hard and cutting,

the wear on the mechanical feeder is very considerable, and it hasbeen found that by passing thev tailings into the feed yhopper without passing them through the said feeder a very considerable wear of the movingv parts of the latter may be saved. Of course it will be understood that the tailings will be carried to the feed hopper by any sort of conveying devices such as are now in common use in machines of' this 110 kind; and that with the use, in a mechanical feeding device, of a feed hopper provided with a separate opening or openings for the entrance of tailings, the feeder will merely be used to supply the fresh lmaterial, the tailings being run into the hopper by gravity, or otherwise.

An anvil ring comprising a plurality of parts or sections properly secured in place has been found to be an advantageous construction, whether or not the said sections be spaced apart to form a grated ring, as shown in Fig. 1; for the reason that with a sectional ring, if one part becomes worn, a new part may be supplied without supplying an entirely new ring, and for this reason we do not wish to be understood as limiting our invention to the particular form o f sectional anvil ring herein shown. .Also instead, of making the anvil. ring separate 13e from the head by which it is carried, as shown in Fig. 1, said ring and head may be integral as shown in Fig. 5 in which the ring portion 17a of the head 16a is shown as being provided with slots to afford discharge openings. Also instead of attaching an open-Work or foraminous anvil ring to a driving head, such ring, if it is to run on outside or inside rollers, may be formed separate from any carrying head, as is shown' by the foraminous ring 16b in Fig. 6. This ring is fully' open on both sides to permlt ,sof the ready discharge of the reduced material from both sides -thereof yas well as through the openings in the ring. In either of the forms of anvil rings hereinbefore described the rings may be made either with plain or with concave working faces, as will ,be understood. It will thus -be understood that the details of the machine may be varied widely from the constructions herein shown and described, without departing from the essence of the invention.

Having thus described our invention We claim and desire to secure by Letters Patent:

1. In a crushing machine, the combination with arotating spoked or skeleton head, of a rotatingforaminous or open-work arvil ring carried thereby, and more or less v"open on both sides, so that the reduced material may be discharged from both sides thereof, a plurality of crushing rolls coperating with said ring, and means for forcing said rolls yieldingly outward toward said ring.

. 2. In a crushing machine, the combination with a rotating spoked or skeleton head, of a foraminous or open-work anvil ring attached to said head to rotate therewith and consisting of a series of spaced annular sections secured together to alford a grated construction, said anvil ring `being more or less open on both sides, so that reduced material may be discharged from both sides thereof, and a plurality of crushing rolls coperating with said ring.

3. In a crushing mill, the combination with a plurality of rotating anvil rings having interior crushing faces and separated from each other by a space or spaces affording a foraminous formation and on which faces the material is held by centrifugal force, of a plurality of hammer rolls running on the interior of said anvil ring faces and on'a track in a predetermined course, and means for forcing said roll or rolls toward said crushing faces by an elastic pressure.

4. In a crushing machine, the combina tion with a rotating spoked or skeleton head, of a foraminous or open-work anvil ringattached to said head to rotate therewith andl rolls, pivoted carriers from which said rolls l are supported, springs acting on said carriers t`o force said rolls yieldingly toward the Working face of the anvil ring, and balance springs acting on said carriers and equalizing the action of the said first-named springs.

6. In a crushing machine, the combination with an anvil ring, of a series `of hammer rolls, pivoted carriers from which said rolls are supported, springs acting on said c'arriers to force said rolls yieldingly toward the working face of the anvil ring, and balance springs acting on said carriers and equalizing the action of the said first-named springs by counteracting gravity, said balance springs being arranged to act on said carriers at right angles to the action of said first-named springs, or approximately so.

7. In a crushing machine, the combina tion with an anvil ring, and hammer rolls, of carriers for said rolls, pressure springs, a central balance washer or plate acting equally on said carriers through the stress of said springs, so as to give an equal pressure to the said rolls, and equalizing springs to neutralize the effect of gravityon each hammer roll.

8. In a crushing` mill, the combination with crushing instrumentalities, of a mechanical feeding device for supplying to the crushing devices the material to be reduced, said feeding device comprising a moving feeding part and a hopper, and said hopper being provided with a feed opening for the entrance of fresh material to the feeding device, and with one or more passageways independent of the said opening, for the mill tailings, so that said tailings may be delivered tothe crushing chamber of the mill without being acted on by the said mechanical feeding device.

Intestimony whereof 'we afix our signatures, in presence of two witnesses.

THOMAS LEGGETT STURTEVAN T. THOMAS JOSEPH STURTEVANT. Witnesses:

GRACE G. GODFREY, H. A. ToMLrNsoN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner. o! Patents, Washington, D. 0. 

